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How Does Machine Espresso Work?

The machine espresso makes use of precision pressure, and filtering technology that is amazing to make the coffee you love. How exactly does it work?

In order to make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee however the main difference lies in the pressure.

The Group Head

The name implies, the group head is the place you place your portafilter when brewing espresso. It disperses water in the portafilter, and controls the pressure of the extraction. There are numerous kinds of group heads each with its own advantages and drawbacks. Some are focused on temperature stability, others on pre-infusion capabilities, and still others are designed to control the lever. Some include a combination such as the E61. This is a popular choice among baristas as it provides a variety of benefits in a single package.

As you can see in the photo above The group head features numerous notches that you can place your portafilter before twisting it manually to lock it in. A gasket of rubber is situated in the notches to create a seal as you insert your portafilter. The notches permit the precise placement of the portafilter. This is crucial for an efficient extraction.

The group head not only allows the portafilter to be inserted easily however, it also keeps an even temperature. This is achieved by cycling hot water around the portafilter, and through the brew basin, ensuring that the temperature is at the right level for extraction. It is crucial to keep in mind that even a tiny difference can make the difference between a decent and a great espresso.

The Pump

Unlike manual piston machines, which use a lever to pressurize water, rotating espresso machines for home machines rely upon motorized pumps to deliver the nine atmospheric bars of pressure that are required to extract espresso. The pressure is built by pumping water through a heat-exchanger and then through the best ground coffee For Espresso machine coffee.

Pumps are typically more affordable and last longer than piston-driven machines. However, both types of machines can degrade because of excessive use and poor cleaning. They also make mechanically complex and can lead to costly prices for even the simplest models.

Some espresso machines make use of steam pressure instead of a pump to brew espresso. The disadvantage of this is that the boiler that produces steam also raises the temperature of water to boiling which can cause excessive extraction. Additionally the machines often have to restore their pressure between cups, which takes time and energy.

A majority of espresso machines utilize an rotary or a vibration pump. A vibration model uses the vibrating disk to create pressure, whereas a rotating model pushes hot water through the ground at a fast speed. Both machines can produce excellent espresso, but rotary machines are more stable, quieter and less likely to break down.

The Boiler

The boiler is used to heat the water to the perfect temperature for extraction. The resulting steam reaches the portafilter that contains the ground espresso coffee, and gets funnelled down into the cup. During this process, steam creates pressure and pushes through the grounds of the coffee. This results in a crema on top of the espresso. This is a hallmark of a great espresso.

There are three distinct types of espresso machines, each with a different type of pump and the temperature of the brew. There are many ways to control the brew as well as the size of cup that can be made by the machine.

The first espresso machines were steam-types. They had one boiler to make both brew and steam, but the pressure they could generate was low - only two bars of atmospheric pressure maximum. The best coffee espresso machine tasted bitter and burnt. This is the reason Milanese producers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most well-known espresso maker is a semi-automatic one with an electric pump. When people think of espresso machines, they envision these machines. With a semi-automatic espresso machine, you must grind the beans and tamp them by hand, but the pump controls the flow of water and pressure. This is an excellent compromise between human touch and the mechanized accuracy.

The Filter

Typically, espresso machines have filters to separate the grounds of coffee when they pass through the hot water. The filter is also a vital component of the machine's temperature control, as it prevents overheating.

A filter also improves flavor because it allows for a longer flowering phase. This allows beans to let their nuances out and provides an opportunity to improve extraction.

However, it is important to remember that even a top filter can make a terrible cup of coffee, since the quality of the beans and extraction is important.

It's in this area that the magic occurs. This is the reason why espresso home machine tastes so good. The grouphead, often referred to as the brew head, is the place where the portafilter (the container you place the coffee grounds into) is placed when making espresso.

Steam-driven espresso machines use hot water that is heated in an airtight vessel to create steam. The steam then moves hot water through the grounds of the coffee under pressure. These types of machines tend to be less expensive and simpler to maintain than pump-driven models. They are however limited to create the perfect brewing conditions as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent years, compressed air pump-driven espresso machines have been gaining popularity. They utilize an air compressor to push hot water through grounds, and are far more portable than steam-driven electric machines.